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S. D. HARTOG, JI.

MANUFATURE 'OP PUNGHES AND DIES.

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UNITED ,l STATES PATENT OFFICE.

STEPHEN D. HARTOG, JR., OF ST. LOUIS, MISSOURI, ASSIGNOR TO THE EUREKASTENCILMACHINE COMPANY, OF SAME PLACE.

MANUFACTURE OF PUNCHES AND DIES.

SPECIFICATION forming part of Letters Patent No. 598,867, dated February8, 1898.

Application tied my 12,1897.

To @ZZ whom, 121'; may concern,.-

Be it known that I, STEPHEN D. HAE'roe, .I r. a citizen of the UnitedStates, residing at St. Louis, in the State of Missouri, have inventedcertain new and useful Improvements in the Manufacture of Punches andDies, of which the following is a specification.

My invention relates to the manufacture of punches and dies to be usedon sheet material-as, for example, the production of paperlstencilsandhas for its object certain improvements whereby any number of duplicatesof both punches and dies may be made by means of a single master-punch.

My invention is illustrated in the accompanying drawings, in whichlFigure lis an elevation of amaster-punch and a plate through which it isto be driven. Fig. 2 is a top view of said plate after being punched.Fig. 3 is the same plate turned over, showing the bottom. Fig. 4 is anenlarged section on the line X X of Fig. 2, showing the effect ofthepunching operation on the metal. Fig. 5 is a section of a matrix ormold made up of a number of such plates riveted together. Fig. 6 is anelevation of a punch cast in such a matrix; and Fig. 7 is an elevation,partly in section, of a punch and die as they are to be used.

In the said drawings, 1 represents a masterpunch cut from a solid blockof vsteel in theVv ordinary manner except that the character is thereverse of the punch to be actually used. The plate 2,in which thecharacter is punched, is shown in plan in Fig. 2. This `character inthis position is the reverse of what is wanted, but when the plate isturned over, as shown in Fig. 3, it is in proper shape. This plate whenfinished becomes the die to be used with the punch hereinafterdescribed.` The reason for making the master-punch the reverse way andthen turning the punched plate over to get the proper form of the diewill become apparent by inspection of Fig. 4, wherein it will be seenthat the punched opening has a rounded edge a at the top and a raggedbut sharp edge b at the bottom. It will be. obvious that it will takemuch less Serial N0. 644,180. (No model.)

labor to remove the bur or ragged edge b,

and thus get a sharp edge for the die than it 5o would be to removemetal enough from the top of the plate to get rid of the round cornersof.. To get a punch that will t a die made in this way, I take a numberof such punched plates and after finishing them-to get a sharp edge onboth sides I secure them to another plate 3 by the rivets 4. This formsa matrix or mold 5, in which is casta punch 6, provided with a screw 7for holding it. A

plan of the matrix shown in Fig. 5 would 6o look like Fig. 3, because itis made up of such plates superimposed upon each other and riveted toanother but unpunched plate to form a bottom. i As the punch 6 is castin lplates made by the master-punch 1, it follows that this punch willalso it any yother plate made by the same master-punch. With onemaster-punch and one matrix made of plates stamped out by themaster-punch it will be evident that any number of die-plates 2 and 7oany number of punches 6 may be made any pair of which will exactly fitand work proplerly together.

Punches and dies made by this process are intended to be mounted in amachine the con- 7 5 master-punch the reverse of the character required,(b) in punching a series of plates therewith, and (c) in securing saidseries of plates in a reversed and superimposed position to an unpunchedplate.

2. The herein-described method of produc- 9o ing a reversed punch whichconsists (a) in punching a plate with a master-punch, (b) in securing toan unpunched plate a number of such punched plates in a reversed andsuperimposed position, and (e) in making a casting in the mold thusformed.

of the frame of the ma- 8o 3. The herein-described method of produc- Ymold, and (c) in making a casting in said mold ing both punches and dies(frsnm a single masto obtain the required punch. ter-punch whichconsists a in punching a, 4 plate by said master-punch and reversing theSTEPHEN D' HARTOG JR' 5 same for a die, (b) in securing to an unpunohedWitnesses:

plate a series of suoh punched and reversed ALFRED A. MATHEY, platessuperimposed on each other to form a LEE SALE.

